Model dossier

Anthropic: Claude Fable 5.1

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...

ProviderAnthropic Start comparison

Context1,000,000

Max output128,000

Pricing viewTVP price

Identity

Anthropic: Claude Fable 5.1

Model ID: anthropic/claude-fable-5.1
Canonical slug: anthropic/claude-fable-5.1-20260831
Knowledge cutoff: n/a
Created: 9/1/2026

Capabilities

textimagefiletoolsstructured

Modalities

text+image+file->texttextimagefile

Capacity

Context1,000,000

Max output128,000

TokenizerClaude